U.S. Navy Petty Officer First Class Dario PerezRincon,

U.S. Navy Petty Officer First Class Dario PerezRincon, a preventive medicine technician with 1st Medical Battalion, 1st Marine Logistics Group, and Lt. Cmdr. Brian Legendre, a preventative medicine officerwith Navy Environmental and Preventive Medicine Unit 5, dig cat-holes during the 2018 Preventive Medicine Exercise at Red Beach, Camp Pendleton, Calif., Oct. 31, 2018. The PREVMEDEX18 was a five day field based training evolution that equipped regional Preventative Medicine Officers, Environmental Health Officers and Preventative Medicine Technicians with the knowledge necessary to preserve the combat readiness of operational forces ashore by preventing illness and injury. (U.S. Marine Corps photo by Lance Cpl. Betzabeth Y. Galvan)